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https://issues.apache.org/jira/browse/HDFS-16424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDFS-16424:
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    Labels: pull-request-available  (was: )

> Add a new rpcMetric called requeueTime
> --------------------------------------
>
>                 Key: HDFS-16424
>                 URL: https://issues.apache.org/jira/browse/HDFS-16424
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: zhanghaobo
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When observer namenode read enabled,  if `call.getClientStateId() > 
> alignmentContext.getLastSeenStateId()`, the rpc call will be requeued to 
> callQueue.
> we need to know rpc requeue metrics to monitor requeue call and its 
> performance.



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